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Diffstat (limited to 'arch/powerpc/kernel/traps.c')
-rw-r--r--arch/powerpc/kernel/traps.c83
1 files changed, 72 insertions, 11 deletions
diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
index 62859ebe0062..a1f8f5641e9e 100644
--- a/arch/powerpc/kernel/traps.c
+++ b/arch/powerpc/kernel/traps.c
@@ -117,7 +117,7 @@ static int die_owner = -1;
static unsigned int die_nest_count;
static int die_counter;
-static unsigned __kprobes long oops_begin(struct pt_regs *regs)
+static unsigned long oops_begin(struct pt_regs *regs)
{
int cpu;
unsigned long flags;
@@ -144,8 +144,9 @@ static unsigned __kprobes long oops_begin(struct pt_regs *regs)
pmac_backlight_unblank();
return flags;
}
+NOKPROBE_SYMBOL(oops_begin);
-static void __kprobes oops_end(unsigned long flags, struct pt_regs *regs,
+static void oops_end(unsigned long flags, struct pt_regs *regs,
int signr)
{
bust_spinlocks(0);
@@ -196,8 +197,9 @@ static void __kprobes oops_end(unsigned long flags, struct pt_regs *regs,
panic("Fatal exception");
do_exit(signr);
}
+NOKPROBE_SYMBOL(oops_end);
-static int __kprobes __die(const char *str, struct pt_regs *regs, long err)
+static int __die(const char *str, struct pt_regs *regs, long err)
{
printk("Oops: %s, sig: %ld [#%d]\n", str, err, ++die_counter);
#ifdef CONFIG_PREEMPT
@@ -221,6 +223,7 @@ static int __kprobes __die(const char *str, struct pt_regs *regs, long err)
return 0;
}
+NOKPROBE_SYMBOL(__die);
void die(const char *str, struct pt_regs *regs, long err)
{
@@ -802,7 +805,7 @@ void RunModeException(struct pt_regs *regs)
_exception(SIGTRAP, regs, 0, 0);
}
-void __kprobes single_step_exception(struct pt_regs *regs)
+void single_step_exception(struct pt_regs *regs)
{
enum ctx_state prev_state = exception_enter();
@@ -819,6 +822,7 @@ void __kprobes single_step_exception(struct pt_regs *regs)
bail:
exception_exit(prev_state);
}
+NOKPROBE_SYMBOL(single_step_exception);
/*
* After we have successfully emulated an instruction, we have to
@@ -1140,7 +1144,7 @@ static int emulate_math(struct pt_regs *regs)
static inline int emulate_math(struct pt_regs *regs) { return -1; }
#endif
-void __kprobes program_check_exception(struct pt_regs *regs)
+void program_check_exception(struct pt_regs *regs)
{
enum ctx_state prev_state = exception_enter();
unsigned int reason = get_reason(regs);
@@ -1260,16 +1264,18 @@ sigill:
bail:
exception_exit(prev_state);
}
+NOKPROBE_SYMBOL(program_check_exception);
/*
* This occurs when running in hypervisor mode on POWER6 or later
* and an illegal instruction is encountered.
*/
-void __kprobes emulation_assist_interrupt(struct pt_regs *regs)
+void emulation_assist_interrupt(struct pt_regs *regs)
{
regs->msr |= REASON_ILLEGAL;
program_check_exception(regs);
}
+NOKPROBE_SYMBOL(emulation_assist_interrupt);
void alignment_exception(struct pt_regs *regs)
{
@@ -1310,6 +1316,18 @@ bail:
exception_exit(prev_state);
}
+void slb_miss_bad_addr(struct pt_regs *regs)
+{
+ enum ctx_state prev_state = exception_enter();
+
+ if (user_mode(regs))
+ _exception(SIGSEGV, regs, SEGV_BNDERR, regs->dar);
+ else
+ bad_page_fault(regs, regs->dar, SIGSEGV);
+
+ exception_exit(prev_state);
+}
+
void StackOverflow(struct pt_regs *regs)
{
printk(KERN_CRIT "Kernel stack overflow in process %p, r1=%lx\n",
@@ -1372,6 +1390,22 @@ void vsx_unavailable_exception(struct pt_regs *regs)
}
#ifdef CONFIG_PPC64
+static void tm_unavailable(struct pt_regs *regs)
+{
+#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
+ if (user_mode(regs)) {
+ current->thread.load_tm++;
+ regs->msr |= MSR_TM;
+ tm_enable();
+ tm_restore_sprs(&current->thread);
+ return;
+ }
+#endif
+ pr_emerg("Unrecoverable TM Unavailable Exception "
+ "%lx at %lx\n", regs->trap, regs->nip);
+ die("Unrecoverable TM Unavailable Exception", regs, SIGABRT);
+}
+
void facility_unavailable_exception(struct pt_regs *regs)
{
static char *facility_strings[] = {
@@ -1451,6 +1485,27 @@ void facility_unavailable_exception(struct pt_regs *regs)
return;
}
+ if (status == FSCR_TM_LG) {
+ /*
+ * If we're here then the hardware is TM aware because it
+ * generated an exception with FSRM_TM set.
+ *
+ * If cpu_has_feature(CPU_FTR_TM) is false, then either firmware
+ * told us not to do TM, or the kernel is not built with TM
+ * support.
+ *
+ * If both of those things are true, then userspace can spam the
+ * console by triggering the printk() below just by continually
+ * doing tbegin (or any TM instruction). So in that case just
+ * send the process a SIGILL immediately.
+ */
+ if (!cpu_has_feature(CPU_FTR_TM))
+ goto out;
+
+ tm_unavailable(regs);
+ return;
+ }
+
if ((status < ARRAY_SIZE(facility_strings)) &&
facility_strings[status])
facility = facility_strings[status];
@@ -1463,6 +1518,7 @@ void facility_unavailable_exception(struct pt_regs *regs)
"%sFacility '%s' unavailable, exception at 0x%lx, MSR=%lx\n",
hv ? "Hypervisor " : "", facility, regs->nip, regs->msr);
+out:
if (user_mode(regs)) {
_exception(SIGILL, regs, ILL_ILLOPC, regs->nip);
return;
@@ -1504,7 +1560,8 @@ void fp_unavailable_tm(struct pt_regs *regs)
/* If VMX is in use, get the transactional values back */
if (regs->msr & MSR_VEC) {
- do_load_up_transact_altivec(&current->thread);
+ msr_check_and_set(MSR_VEC);
+ load_vr_state(&current->thread.vr_state);
/* At this point all the VSX state is loaded, so enable it */
regs->msr |= MSR_VSX;
}
@@ -1525,7 +1582,8 @@ void altivec_unavailable_tm(struct pt_regs *regs)
current->thread.used_vr = 1;
if (regs->msr & MSR_FP) {
- do_load_up_transact_fpu(&current->thread);
+ msr_check_and_set(MSR_FP);
+ load_fp_state(&current->thread.fp_state);
regs->msr |= MSR_VSX;
}
}
@@ -1564,10 +1622,12 @@ void vsx_unavailable_tm(struct pt_regs *regs)
*/
tm_recheckpoint(&current->thread, regs->msr & ~orig_msr);
+ msr_check_and_set(orig_msr & (MSR_FP | MSR_VEC));
+
if (orig_msr & MSR_FP)
- do_load_up_transact_fpu(&current->thread);
+ load_fp_state(&current->thread.fp_state);
if (orig_msr & MSR_VEC)
- do_load_up_transact_altivec(&current->thread);
+ load_vr_state(&current->thread.vr_state);
}
#endif /* CONFIG_PPC_TRANSACTIONAL_MEM */
@@ -1656,7 +1716,7 @@ static void handle_debug(struct pt_regs *regs, unsigned long debug_status)
mtspr(SPRN_DBCR0, current->thread.debug.dbcr0);
}
-void __kprobes DebugException(struct pt_regs *regs, unsigned long debug_status)
+void DebugException(struct pt_regs *regs, unsigned long debug_status)
{
current->thread.debug.dbsr = debug_status;
@@ -1717,6 +1777,7 @@ void __kprobes DebugException(struct pt_regs *regs, unsigned long debug_status)
} else
handle_debug(regs, debug_status);
}
+NOKPROBE_SYMBOL(DebugException);
#endif /* CONFIG_PPC_ADV_DEBUG_REGS */
#if !defined(CONFIG_TAU_INT)
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-24 03:42:06 +0000